In the CBS interview, the president was asked about why the North's rockets keep blowing up.
President Donald Trump said on Twitter, "North Korea disrespected the wishes of China & its highly respected President when it launched, though unsuccessfully, a missile today".
The missile test failed as it exploded just after take-off, but it further fuelled the mounting tension between the USA, its allies and North Korea over its nuclear weapons programme.
He was reacting after a North Korean mid-range ballistic missile apparently failed, the third flop in a month.
"He's dealing with obviously very tough people, in particular the generals and others".
In an interview with CBS News's John Dickerson that aired Sunday on "Face the Nation", Trump said he would not be pleased if North Korea takes that step. A lot of people, I'm sure, tried to take that power away, whether it was his uncle or anybody else. "But he has to understand we won't be very happy".
"The threat of a North Korean nuclear attack on Seoul or Tokyo is real, and it is likely only a matter of time before North Korea develops the capability to strike the USA mainland", Tillerson said.
Pyongyang on Saturday staged a new ballistic missile test, but the projectile apparently exploded just minutes after being launched, according to South Korean and United States military sources.
Trump refused comment on whether the United States had anything to do with the missile test failure. He added: "It is a chess game".
'We are not a poor country' - Mugabe
The post Zimbabwe is the most highly developed country in Africa - Mugabe appeared first on Vanguard News. "We have resources, perhaps more resources than the average country in the world, gold, diamonds, chrome, coal, et cetera".
"People are saying: 'Is he sane?' I have no idea ... but he was a young man of 26 or 27 ... when his father died". "Eventually, he will have a better delivery system. I mean, we'll see".
Hours before the North Korean test, US Secretary of State Rex Tillerson warned of "catastrophic consequences" if the worldwide community does not act more forcefully to sanction Pyongyang.
It was the third test-fire flop just this month but a clear message of defiance as a United States supercarrier conducts drills in nearby waters.
Separately, Trump's national security adviser, Army Lt. Gen. H.R. McMaster, said North Korea's most recent missile test represents "open defiance of the global community".
The president also emphasized China's role in putting pressure on North Korea and said he has established a good relationship with President Xi Jinping.
McMaster said that as far as North Korea's nuclear ambitions are concerned, Trump "has made clear that he is going to resolve this issue one way or the other", but the president's preference is to work with China and others to resolve it without military action.
"I don't see this happening anytime soon".
Trump assailed the failed launch as a show of disrespect toward its ally China.
Though diplomatic efforts with the Kim regime have failed in the past, experts have told Business Insider that with the increasing capability of North Korea's nukes and mounting global pressure, they may represent the only way to avert a full crisis.